Pneumatic Operation; Sample Gas Flow; Figure 10-7: M100 Gas Flow And Location Of Critical Flow Orifice - Teledyne 100E Instruction Manual

Theory Of Operation

10.3. Pneumatic Operation

It is important that the sample airflow system is leak-tight and not pressurized
over ambient pressure. Regular leak checks should be performed on the
analyzer as described in the maintenance schedule, Table 9-1 . Procedures for
correctly performing leak checks can be found in Section 11.5.1.
In this manual vacuum readings are given in inches of mercury absolute pressure (in-
Hg-A), i.e. indicate an absolute pressure referenced against zero (a perfect vacuum).

10.3.1. Sample Gas Flow

The Flow of gas through the M100E UV Fluorescence SO2 Analyzer is created by a small
internal pump that pulls air though the instrument.
INSTRUMENT CHASSIS
SAMPLE GAS
INLET
EXHAUST GAS
OUTLET
SPAN GAS INLET
ZERO AIR INLET

Figure 10-7: M100 Gas Flow and Location of Critical Flow Orifice

172
Caution
Relative Pressure versus Absolute Pressure
EXHAUST TO OUTER
LAYER OF KICKER
FLOW
CONTROL
ASSY
FLOW
SENSOR
Model 100E Instruction Manual
SAMPLE
CHAMBER
PMT
SAMPLE
PRESSURE
SENSOR
FLOW / PRESSURE
SENSOR PCA
PUMP
UV
LAMP
HYDROCARBON
SCRUBBER
(KICKER)
SAMPLE
FILTER
045150102 Rev XB1